thick

having relatively great extent from one surface or side to the opposite; not thin:

a thick slice.

2.

measured, as specified, between opposite surfaces, from top to bottom, or in a direction perpendicular to that of the length and breadth; (of a solid having three general dimensions) measured across its smallest dimension:

a board one inch thick.

3.

composed of or containing objects, particles, etc., close together; dense:

a thick fog; a thick forest.

4.

filled, covered, or abounding (usually followed by with):

tables thick with dust.

5.

husky or hoarse; not distinctly articulated:

The patient's speech is still quite thick.

6.

markedly so (as specified):

a thick German accent.

7.

deep or profound:

thick darkness.

8.

(of a liquid) heavy or viscous:

a thick syrup.

9.

Informal. close in friendship; intimate.

10.

mentally slow; stupid; dull.

11.

disagreeably excessive or exaggerated:

They thought it a bit thick when he called himself a genius.

adverb, thicker, thickest.

12.

in a thick manner.

13.

close together; closely packed:

The roses grew thick along the path.

14.

in a manner to produce something thick:

Slice the cheese thick.

noun

15.

the thickest, densest, or most crowded part:

in the thick of the fight.

Idioms

16.

lay it on thick, Informal. to praise excessively; flatter:

He's laying it on thick because he wants you to do him a favor.

17.

through thick and thin, under favorable and unfavorable conditions; steadfastly:

Old English þicce "not thin, dense," from Proto-Germanic *theku-, *thekwia- (cf. Old Saxon thikki, Old High German dicchi, German dick, Old Norse þykkr, Old Frisian thikke), from PIE *tegu- "thick" (cf. Gaelic tiugh).

Secondary Old English sense of "close together" is preserved in thickset and proverbial phrase thick as thieves (1833). Meaning "stupid" is first recorded 1590s. Phrase thick and thin is in Chaucer (late 14c.); thick-skinned is attested from 1540s; in figurative sense from c.1600. To be in the thick of some action, etc., "to be at the most intense moment" is from 1680s, from a Middle English noun sense.